<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>websocket demo</title>
</head>
<body>
    <script>
        var ws = new WebSocket('ws://localhost:8080');
        ws.onopen = function () {
            console.log('ws onopen');
            ws.send('from client: hello');
        };
        ws.onmessage = function (e) {
            console.log('ws onmessage');
            console.log('from server: ' + e.data);
        };
    </script>
</body>
</html>